If you're not already a tax resident of Portugal and you decide to legally move there, you can apply for a special tax rate as a "non-habitual resident" that gives you a lower tax rate for ten years.
Interesting. I wasn't aware that it was already valid or so lax (20% vs 48%!). This measure was sold by government as a way of bringing back our emmigrants.
https://www.livinginportugal.com/en/moving-to-portugal/tax-r...